I put one new rock of pink/green yuma about 16" from 220w of fluorescent. It was less than a foot away from a couple VHO tubes at the store. They yumas looked fine for about 3 weeks, but began to fade, showing a lot of white. I left them alone, and they colored back up in maybe a month.
Months later I moved them to the bottom of a 72 bowfront under 2x250 14k mh. They stayed there for quite a few months, and the color was just ok.
Recently I relocated them to the bottom of an 80g softie tank. Tank runs 4 tubes of 2x ODNO fluorescents. 2 Home Depot Phillips daylight tubes, and 2 actinics. The color improved tremendously in just a week or two.
I ended up moving all my mushrooms to that tank.